linux-kernel - Re: [PATCH 4/4] tty/serial: atmel: enforce tasklet init and termination sequences

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Date:	Sat, 25 Jun 2016 13:39:59 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: [PATCH 4/4] tty/serial: atmel: enforce tasklet init and
 termination sequences

On Fri, Jun 17, 2016 at 12:05:49PM +0200, Nicolas Ferre wrote:
> As some race conditions are identified in the termination process of tasklets,
> enforce the atmel_shutdown() sequence. This way we make sure that no new
> tasklets or software timer are scheduled during shutdown process.
> 
> An atomic flag is positioned to give this information throughout the code.
> 
> We also remove tasklet_disable() calls that were leading to deadlocks while
> stopping the driver. A simpler init/kill sequence is used.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---
>  drivers/tty/serial/atmel_serial.c | 61 ++++++++++++++++++++++++---------------
>  1 file changed, 38 insertions(+), 23 deletions(-)

You obviously didn't even test build this patch, as it breaks the build :(

please be more careful...

greg k-h